I wanted something like a tinySA that I could carry around, but that could also listen to what it finds and tell me what a signal is. So I built SDR-Kit: a Raspberry Pi Zero 2 W with an RTL-SDR, and a web panel you open on your phone. No app, no internet needed.

What it does:

• Spectrum analyzer + waterfall, 0.5–1766 MHz, with markers, channel power, OBW, SNR, zero span, max hold, etc.

• Tap a signal to listen to it: FM, AM, WFM, USB/LSB, plus digital voice through DSD-FME (optional).

• It tries to tell you what the signal is by its shape (2/4-FSK, GMSK, AFSK, symbol rate).

• Decoders: POCSAG/FLEX pagers, APRS, EAS, 433/868/915 MHz sensors (rtl_433) and an offline ADS-B radar (dump1090).

• Scanner, memories, per-transmission recording and a 24/7 monitor with phone alerts.

• Joins your WiFi at home, makes its own hotspot in the field, or works through Tailscale.

Install is one line on Raspberry Pi OS, and updates roll themselves back if something breaks.

You can try it without any hardware: there's a demo mode that simulates real, decodable signals (pagers, APRS, FM stations…), so you can click around on a laptop first.

It's MIT licensed, receive-only, and the interface works in English and Spanish.

Repo + screenshots: https://github.com/romartak/sdrkit

I'm a medical student and this is a side project, so I'd really appreciate feedback: what's missing, what's confusing, or what breaks on your dongle.

Hello i am going on a cruise in a few weeks and i plan to take my rtl sdr v4 along with me with a couple antennas:

1 quarter groundplane for ads-b

1 quarter groundplane for ais, flexible conductors held straight with 3d printed parts so i dont go carrying around solid half meter sticks of metal around

1 rubber duck for ais (didnt take a pic)

I am aware that i cant bring trasmitters onboard but there aint no rules for bringing radios onboard

Its an msc cruise.

So I’ve been messing around with SDRangel trying to decode ADS-B traffic, and I got that side of it to work but I can’t seem to get the map to function, and under features I can’t even find the map, I understand it’s more than likely a API issue in why it’s showing blank but I can’t even get to the settings to set up my Cesium Ion api. Anyone got any help? Much application in advance

I wanted to share my failure (thus far) to determine why my garage door opener doesn't work when it's below ~50f and the light is on. I thought it was interference from the LED bulbs, so I replaced them. That didn't work so I bought a plug-in shop light and an adapter to turn the light socket into an outlet, so the light source can be far away from the antenna - no luck.

So I decided to get more technical. I dug out the RTL-SDR I bought ten years ago and installed SDR++. I was hoping to find interference from the light or opener in the range of the emitter, but I didn't.

First, I had to find where my two clickers emitted. That's the waterfall you see. The two blips on the left are the newer (2 years) emitter, and that mess on the right is the older (20 years) one that is usually in my car. Yeah, wtf.

Now, I'm just a chemist, but that looks sloppy as hell. Not only is it sloppy, the freq. changes when I tilt the emitter. What could cause the frequency to drift when I rotate the device? There's nothing lose in there, it's a very simple circuit.

At least I knew where to look for interference, but when I took my laptop out to my garage, I found no evidence whether the light was on or off, but I have to hold the new emitter just inches away from the antenna to get it to work when the light is on - the old one won't work at all until the light times out. This remains true even when there are no lights connected.

So I'm no closer to making the door work. I think I'll try improving the antenna, which is currently just a wire hanging from the opener.